Suppose you're doing a search form. This search form can be using fields from many different ActiveRecord models and probably doesn't correspond to any table in your database.
What's nice about being an ActiveRecord model is that in the view, you can do wonderful things like a form_for helper or error_messages_for helper. Furthermore, ActiveRecord provides you a collection of wonderful validation functions.
However, without ActiveRecord, your solution would be to do it all by hand. How very sad T.T
This is where ActiveForm is a time saver! Basically, you create an ActiveForm model exactly the way you would an ActiveRecord model. It even supports validation! Furthermore, it is supported in the view, so all those helpers will still work! Just wonderful!
You can grab it as a plugin from here:
http://www.realityforge.org/svn/code/active-form/trunk
Enjoy!
W
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